Sander



'Aug. l5, 1939 J. H. mNc;` l I 2,159,954

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ENTQR Aug. 15, 1939 J H, K'ING 169,954

SANDER Filed Sept. 20, 1938 3 Sheets-Sheef 2 n y,\ A A J. H. KING Aug. 15, 1939 l SANDER Filed sept. 2o, 1938 3 Sheets-Sheet 3 .a .1. lha.

y e' ayzm@ ATTO R N EYS Patented Aug. 15, 1939 UNITED smrEs ATENT OFFICE SANDER. John Howard King, Mansfield, Ohio Application September 20, 1938, Serial No. 231,351

3 Claims.

My invention relates to the surfacing of wood material'fand the like and includesamong its objects and advantages the provision of an improved abrading machine.

fAn object of my inventionY is to provide an abrading machine commonl'ydesignated a sander wherein novel'means is incorporated to facilitate the executionof precision work.

Another objectis to provide an abrading machine embodying `a work table and a rotary abrading drum mounted thereabove in which novel pressure rolls are associated with the abradingdrum in such manner as to effectively straighten the work as it passes across the face of the drum to the end that the work may be abraded to uniform' thickness.

A further object is to provide an abrading machine including a work table and a sanding drum adjustably related thereto in which novel pressure rolls are operatively associated with the drum for adjustment therewith and in which novel means are incorporated for simultaneously adjusting the drum and the pressure rolls.

In the accompanying drawings: V

Figure 1 is atop plan view of a machine embodying my invention with a part removed;

. Figure 2 is a side elevational view;

Figure 3 isa sectional View along the line 3-3 of Figure 1; 1

-Figure 4 is a sectional view along the line 4 4 of Figure 1;

Figure 5 is a sectional view along the line 5 5 of Figure 2; Y

Figure Gis a sectional view along the line 6-6 of Figure 4; and

Figure '7 is a sectional view along the line 1 1 of Figure 5.

In the embodimentV selected to illustrate my invention, I make use .of a work support or table I0 which functions as a base for the machine. On the upper face of the table I6 I mount upright walls I2 each of which comprises sections I4 and I6. A drum vI8 is positioned above the work table I0 and is connected with afshaft 20 having its ends journaled in blocks 22 slidably related tothe walls I2. Drum I8 includes the usual V-shaped trough24 within which the ends 26 .ofthe sand paper or other abrading sheet 28 are positioned and made secure by the key strip 30 and bolts 32. Such fastenings are well-known in the art and need not be described in further detail.

Figures 4 and 6 illustrate the manner in which the blocks 22 are slidably relat'ed to their respective walls I2. According to Figure 6, the sections I4 and I6 of the wall l2 are spaced and their vertical edges are grooved at 34 for slidably receiving the vertical edges of the block 22. To each block 22 I iixedly connect a screw 36 by a key 38, and the screws 36 extend loosely through 5 openings 4U in a plate 42 which interconnects the side walls l2. Each screw 36 has threaded relation with a sprocket 44 which lies adjacent the upper face of the plate 42 and is connected with a sprocket chain 46.

Adjacent the upper faces of the sprockets 44 I position compression springs 48 which are held under tension by brackets 50 connected to the plate 42 by bolts 52 which may extend through the plate 42 and have threaded relation with the 15 side walls I2 for connecting these parts into a unitary structure. `Upon the plate 42 and substantially intermediate the sprockets 44 I mount a sprocket 54 which has connection with the chain 46 for actuation purposes. A handle 56 is 20 fixedly connected with the sprocket 54 to facilitate turning thereof. Sprocket 54 is rotatably mounted on a shaft 5B having a shank 60 extending through a slot 62 in the plate 42. A nut 64 is threaded on to the shank 66 for drawing the 25 shoulder 66 of the shaft 58 against the plate 42 for securing purposes. The shaft 58 may be provided with a flange 68 to restrain the sprocket from relative movement longitudinally of the shaft;

Rotation of the sprocket 54 imparts motion to the chain 46 which in turn rotates the sprockets 44. Screws 36 are keyed to the blocks 22, but the sprockets 44 have threaded connection with the screws so that rotation of the sprockets raises 35 or lowers the screws depending upon the direction of rotation of the sprocket 54. Since the drum I8 is carried by the blocks 22, adjustment of the screws 36 will impart corresponding adjustment to the drum I8 for accurately locating 40 the same with respect to the work table I0. The screws 36 are turned simultaneously and areoi' the same pitch so that thel drum I8 will always take a position in parallel relation with the work table. In Figures 1, 3 and 4 I illustrate pressure 45 rolls 1l! associated with the drum I8 in such manner as to press the work 12 against the work table I0, To each'of the blocks 22 I pivotally connecta pair of bell cranks 14as at 16. According to Figure 4, the bell cranks 14 have their 50 reaches 18 extending in opposite directions and having supporting connection with shafts 8|! which support the pressure rolls 10. The spring 82 of Figure 4 interconnects the bell cranks 14 in such manner as to urge the pressure rolls 10 55 downwardly against the work 12. In the same view, I illustrate a stop pin 84 anchored to the block 22 for limiting the downward movement of the pressure rolls 10. The bell cranks are recessed to provide shoulders 86 which, in the absence of the work 12, abut the stop pin 84 for limiting downward movement of the pressure rolls.

Springs 82 will yield when the work 'I2 is pushed underneath the pressure rolls. The tension of the springs 82 is such as to effectively bend thin Work flat against the work table I so that the nished work will be of uniform thickness. Drum I8 is easily and quickly adjusted to accommodate work of variable thickness through the medium of the sprocket 54. Such adjustment of the drum I8 simultaneously raises or lowers the bell cranks 14 which in turn causes the pressure rolls 'I0 to be adjusted with the drum I8. Stops 84 are so related to the shoulders 8B as to permit the pressure rolls to take normal positions beneath the drum I8 so as to have pressure relation with the work. Figure 6 illustrates the sections I4 and I6 as being recessed at 88 for housing the bell cranks 14. In thus housing the bell cranks, the pressure rolls may embody lengths greater than the Width of the work table so as to insure effective pressure relation between the pressure rolls and the work throughout its entire width. This is particularly important when working on relatively thin material. The ends of the drum I8 fit snugly against the side walls I2.

One end of the shaft 20 is extended at 90 for connection with a disc sander 92. To the adjacent wall I2 I connect a pair of brackets 94 through the medium of bolts 96. Brackets 94 include curved tracks 91 which slidably receive curved arms 98 connected with a work table I 00. Figure '7 illustrates the specific construction of the tracks 91 and their relation with the curved arms 98. In this gure, the curved arm 98 illustrated therein includes a slot |02 extending substantially full length of the arm. A bolt |04 has its head |06 lying between the iianges |08 of the arm, while the bolt extends through the slot |02 and through an opening ||0 in the bracket 94. A hand wheel II2 has threaded connection with the bolt |02 for drawing the arm 98 into xed relation with the bracket 94. Both arms 98 are of identical construction, while one of the arms may be provided with graduations II 4 arranged in reading relation with a pointer IIS fxedly connected with the bracket 94 associated therewith. Graduations I I4 may be in terms of angles `for determining the angular relation between the work table |00 and the work face of the sanding disc 92. Wall I2 is provided with openings I I8 for accommodating the arms 98 as the table |00 is being lowered for increasing the angular relation between the table and the sanding disc 92.

In operation, work is pushed through the machine against the rotation of the drum I8. Springs 48 are of sucient tension to effectively hold the drum in proper pressure relation with the work being finished. In cases where the Work is passed through the machine in the wrong direction or the drum I8 is rotated in the wrong direction the work will be pulled underneath the drum I 8. Under such conditions the compression springs 48 will yield to permit the drum I8 to be elevated so as to prevent damage to the machine. Side walls I2 are arranged in right-angular relation to the work table I0. Relatively thin Work may be edged by pressing the Work against one of the side walls as it is being pushed through the machine.

Shaft 20 is extended beyond one of the walls I2 and carries a grooved wheel |20 for connection with a source of power (not shown).

I claim:

l. An abrading machine comprising a work table, side members, bearing blocks slidably related to the side members, a sanding drum rotatably journaled in the bearing blocks, a screw fixed to each bearing block, sprockets having threaded relation with the screws, an operating chain passing about said sprockets for rotating the screws, to adjust the sanding drum toward and away from the work table, a pair of work pressure rolls, a bell crank support for each end of each of the work pressure rolls pivotally connected with one of said bearing blocks, spring means interconnecting the two bell crank supports at the ends of the work pressure rolls for urging the latter downwardly on the work, and means for limiting the downward pressure movement of the work pressure rolls.

2. An abrading machine comprising a work table, spaced side members, bearing blocks slidably related to the side members, a sanding drum rotatably journaled in the bearing blocks, screw means for adjusting the bearing blocks vertically to shift the sanding drum toward and away from the work table, a pair of work pressure rolls, a pair of bell cranks pivotally connected to each bearing block with each bell crank having a supporting connection with one end of one of the work pressure rolls, spring means connected with the bell cranks for urging the work pressure rolls downwardly on the work, and stop means for limiting the downward movement of the work pressure rolls, said stop means being so arranged with respect to their respective bell cranks as to permit the work pressure rolls to drop to normal positions predetermined distances below the sanding drum, but being so arranged as to hold the work pressure rolls spaced from the work table in elevated positions of the sanding drum.

3. An abrading machine comprising a Work table, side members associated with the work table, bearing blocks slidably related to the side members, a sanding drum rotatably journaled in the bearing blocks, screw means operatively connected with the bearing blocks for adjusting the latter relatively to the side members for adjusting the sanding drum toward and away from the work table, a pair of work pressure rolls, and operating connections between the work pressure rolls and said bearing blocks for urging the work pressure rolls into engagement with the work, but operating to limit the downward movement of the work pressure rolls so as to hold the latter spaced from the work table in elevated positions of the sanding drum.

JOHN HOWARD KING. 

